Rotary pump



Feb. 26, 1952 F. KRAissl., JR 2,586,964

ROTARY PUMP Filed Sept. 24, 1946 2 SHEETS- SHEET l ,95) 3j @NA/9ATTORNEYS Feb. 26, 1952 F. KRAlssL, JR 2,586,954

ROTARY PUMP Filed sept. 24, 194e 2 SHEETS-SHEET 2 ATTORN EYS PatentedFeb. 26, 1.9.52

UNITED STATES PATENT OFFICE ROTARY PUMP Frederick Kraissl, Jr., NorthHackensack, N. J. Application September Z4, 1946, Serial No. 698,907

(Cl. S- 136) 2 Claims. 1

This invention relates to improvements in rotary pumps and has for aprincipal object the provision of a rotary pump in whichk the mainwearing surfaces are oatingly in-dependent of each other and adapted tobe removed and replaced manually, thereby enabling the user to removethe worn parts of the pump and replace them with the new ones withouthaving to replace the entire pump per se.

Another object of the invention is the provision in the rotary pump of arotor having roller slots 120 apart, thereby enabling the pump cylinderto be bored on a true circle. By this arrangement, the urge to rotatethe rotor is the same throughout the 360 of roation, and no tight placeis encountered as is the case in rotors employing a larger number ofblades or rollers.

Yet lanother object of the invention is the provision in the rotary pumpof a shaft, the diameter of which is the same throughout its length, arotor secured to said shaft and having counterbored portions on each endthereof, rings oatingly positioned in said counterbores, rollersiloating in slots formed in said rotor, said rings and said rollersbeing of such diameters that the sums thereof, when in proper relation,are substantially equal to the bore of the cylinder in which the saidrotor, the rollers kand said rings rotate, thereby maintaining rollingmotion of the rollers against the bore of the cylinder at all times;special advantage being obtained whereby the rollers and rings arecaused to revolve continuously, keeping all wear at a minimum.

In order to keep the rolling action of the rollers as even as possible,when they pass the suction and discharge ports, said ports are spannedby V-shaped webs, thereby keeping the pressure substantially constantthroughout the length of the rollers and reducing any tendency to skidand thereby obviating uneven wear both on the rollers and in thecylinder bore.

Yet another object of the invention is the provision in a rotary pump ofa rotor having a plurality of slots formed therein and replaceable wearplates set into the trailing faces of said slots, said plates beingadapted to be removed and replaced after their outer surfaces becomeworn.

Another object of the invention is the provision in a rotary pump of ashaft which extends from both ends thereof, said shaft being providedwith stuii'ing boxes near each end thereof, and bearing means supportedon said pump and engaging the shaft beyond said stuiiing boxes.

Other objects and advantages of the invention will be apparent to thoseskilled in ther artupon a study of the lfollowing specification,v andkthe accompanying drawings.

In the drawings, which are given merely by Way of example to illustratethe invention:

Figure 1 is a front .elevation of my new and improved rotary pump;

Figure2 is a sectional elevation of the pump shown in Figure 1;

Figure 3 is a sectional elevation ofthe pump as seen along the lines 3 3.of Figurel;

Figure 4 is a sectionalelevation of the pump cylinder alone as seenalong .the lines ll, 4 of Figure 3,. showing ,the discharge or exhaustport of my` newvand improved pump; .and

Figure 5 is a perspective view of the rotor of my new and improvedpump,showing one method of mounting the wearing plates in the trailing facesof the slots in said rotor.

Referring first to Figures 1 and 2, my new and improved rotary pumpincludes a body I Ahaving a cylinder Il with flanges l2 and I3 at eachend thereof.

Formed integral with the flanges i2 and i3, at the bottom thereof, is amounting base ill which may include mounting holes i5.

The cylinder bore is indicated ati6. The cylinder has an inlet boss Ilhaving an inlet passage ila formed therein. The cylinder also has. anoutlet boss I8 and an outlet passage I8a formed therein, as maybe seeninFigure 3. The

vpassage lla communicates with the interior of a swiveled fitting i 9which is secured to the boss I1 by means of a screw 2l. The upper endofthe fitting i9 may terminate in a flange ISa for connection to any pointof use. The passage Ita U.communicates with the interior of a swiveledfitting 2B which is secured to the boss I 8 by means of a screw 22. Theinlet passage lla terminates in the wall of the cylinder to form a port23, which may be termed the inlet port. Likewise, the passage Itaterminates in 'a port 24, which maybe termed the discharge or outletport, and the fitting 20 maybe provided with a flange 29a for connectionto a point of use.

In Figure 4, they discharge port may consist of openings 25, 26, and 2l,with Webs 2B and 29 therebetween. The combination of the webs 28 and 29cooperate with the cylinder bore i6 to present additional surface to therollers (to be presently described) for the purpose of equalizing thewear Ion these rollers. The inlet port 23 may be formed in the samemanner or it may be varied in accordancewith the conditions under whichthev pump is to operate and/or the Inaterial which it is to handle,

Turning to FigureY 2,.,then pump isprovided with a shaft 3B which, itwill be noted, is preferably the same diameter throughout its length.This eliminates the necessity for stepping the shaft to form shouldersthereon. An end plate 3| has a face 32 which abuts the flange l2 and hasformed integral therewith a boss 33. Spaced apart from the boss 33 is alarger boss 34 which is joined to the end plate 3| by means of ribs 34a,and 34h. The boss 33 is provided with a bore 33a through which the shaft30 may pass and concentric therewith is a counterbore 35. At the bottomof the counterbore 35 is a beveled ring 36 which is connected through apassage (not shown) in the end plate 3| to the suction side of the pump,thereby reducing the pressure on the stung box to a pressure lower thanatmospheric pressure. The stuiing box includes a gland 3l and betweenthe gland 3l and the ring 36 is suitable packing 38. Suitable means isprovided for urging the gland 3l to the left, as seen in Fig. 2, butsince such means is old in the art, it need not necessarily be shown.

A second end plate 3S is identical with end plate 3|. It has a face 43which seats against the flange I3, and thus the end plates 3| and 39enclose the cylinder 'bore I6. The end plate 35 has a boss 4| formedintegral therewith and spaced apart from this boss is a second boss 42,which is larger in diameter and which is joined to the end plate 39 bymeans of ribs 42a. and 42h. The boss 4| has a hole 43 therein, throughwhich the shaft 30 extends and this boss has a counterbore 44 toaccommodate a stuing box which may include a ring 45, the beveled innerface oi which communicates with the suction side of the pump.

' Mounted in the counterbore 44 is a gland 43, and

suitable packing 41 is employed between the gland 45 and the ring 45.

Secured on the shaft 30 is a rotor i8 which generally cylindrical inform, as may be seen in Figure 3. The rotor is keyed or otherwise fixedto the `shaft and moves therewith.

Formed in the rotor are slots 49, 55 and 5|. These slots aresubstantially 120 apart and the sides of the slots are of such widththat rollers 52, 53 and 54 mounted in these slots in the order named,form working ts therewith.

Referring again to Figure 2, the rotor has a counterbore 55 formedtherein in one end thereof and a second counterbore 56 formed in theopposite end thereof. Positioned within these counterbores arerespectively ring members l and 58. These ring members are of suchdiameter that when the three rollers are in contact with the cylinderbore I5 they may be slipped between the rollers and they function tokeep the rollers out near or in contact with the cylinder bore at alltimes.

From a study of Figure 3, it will be obvious that as the rotor 48 isrotated in a counterclockwise direction, the fluid medium being handledhas just been trapped between the rollers 54 and 52, the bore I6 of thecylinder, and the outer periphery of the rotor between the rollers 54and 52. As the rotation continues the space described decreases until apoint is reached where the roller 52 uncovers the lower edge of thedischarge port 24, with the result that further rotation of the rotorcauses substantially all of the fluid medium confined within the spacedefined above to be discharged into the passage |8a via the dischargeport 24. By this time, the rollers 54 and 53 have trapped a like volumeof the ud medium and as the rotation continues and the roller 54uncovers the port 24, the medium is discharged into the passage |811.Thereafter, a third volume of fluid medium is trapped between therollers 53 and 52 and subsequently, this ud medium will be released intothe passage |8a as the roller 53 uncovers the port 24. etc.

In Figure 3, the roller 53 is shown as having traveled its maximumdistance into the slot 5G. When the roller 54 reaches the bottom of thecylinder bore with its center in line with the center of the cylinder,the roller 54 will have advanced outwardly in the slot, its maximumdistance, and as it passes the center and moves to the right (directionof the arrow), it again is moved toward the bottom of its slot.

I have found that by inserting wear plates. such as wear plates 59, 50and 6| in the trailing faces of the slots 49, 53 and 5|, these platesget the brunt of the wear and may consequently be made of materialcapable of withstanding hard wear. These wear plates are insertedendwise in slots such as the slots shown in Figure 5, wherein theshallow slot 62 is formed in the trailing face of the blade slot 5|.rlhe slot 52 has its inner end 53 beveled. Communicating with the slot52 is a deeper and narrower slot |34. The wear plate 5| has its outeredge 65 conforming to the outer diameter of the rotor. The body 55 ofthe plate is of s-uch thickness that when the plate is mounted in theslot 62 formed in the face Sia oi the blade slot 5|, its outer surfaceis flush with the surface 5 ia.

integral with the plate 5| is a portion 5i which is beveled and whichcooperates with the beveled groove 53. Also integral with the plate 5|is a tongue portion 58 which forms a working fit in and cooperates withthe slot E4. This plate is slid in endwise and is locked in position bythe beveled portion 61 and the tongue portion 58, and it cannot get outof the rotor endwise unless an end plate is removed and the rotor isremoved from the pump.

Referring again to Figure 2, the boss 34 has a hole 69 formed thereinconcentric with the shaft 30, and from the outer end the boss 34 has acounterbore 'IB formed therein to accommodate the outer race 'l2 of aball bearing 1|. The ball bearing has an inner race 'i3 which forms afit on the shaft 35 and extends beyond the ball bearing to carry asleeve 14. Threadedly engaging the sleeve 14 is a screw 75, the point ofwhich extends through a clearance hole formed in the extension vof theinner race T3.

Likewise, the boss 42 has a hole l5 which is concentric with the shaft35 and from the outer end, the boss has a counterbore 'il' formedtherein to accommodate the outer race i9 of ball bearing 78. The innerrace 83 of this ball bearing extends beyond the ball bearing toaccommodate a sleeve 8|. The sleeve 8| has a threaded hole formedtherein to accommodate a screw 32 and the point of the screw extendsthrough a clearance hole in the inner race 8B so that the point of thescrew may engage the shaft 35.

It will be noted that the holes B9 and 16 are of sufficient diameter topermit the heads of the glands 46 and 3l, respectively, to passtherethrough. The end plates 3| and 33 are secured to the pump body bymeans of screws 83.

The fittings I9 and 23 secured to the pump body by means of screws 2|and 22, respectively, form swivel ts with the .pump body and byloosening the screws 2| or 22, either or both of the fittings may beswung to any angle desired, and thereq fore the connection between theinlet and outlet ports and the point of use is facilitated. The pumpbody, it will be noted, is ribbed to make it very light in weight, andyet substantially strong structurally. A central web 84, Figure 3, joinsthe cylinder wall and extends down into a horizontal web 85, which maycontain the holes l5 for the mounting screws.

Although I have herein shown and described by way of example oneembodiment of my new and improved rotary pump, it is obvious that manychanges may be made in the arrangements herein shown and describedwithout departing from the spirit of the invention as set forth in theannexed claims.

What is claimed is:

1. In a rotary pump, a body having a cylindrical bore therein and inletand discharge ports communicating therewith, end plates forming closurestherefor, said end plates carrying bearings eccentric to said bore, ashaft mounted in said bearings, a rotor xed on said shaft and having aplurality of blade slots formed therein, blade means in said rst slotsadapted to cooperate with said bore; said blade slots having cut-outportions in the form of comparatively radially shallow slots, eachhaving its radially inner edge beveled, and a radially narrower slotextending in the same direction from said blade slot and radiallycommunicating with said shallow slot intermediate its )zo radial innerand outer edges, a hardened and ground wear plate in and forming aworking t with each cut-out portion, each plate having: an outer edgeconforming to the outer diameter of the rotor, a beveled inner edgewhich mates with the inner edge of said shallow slot, and a, tongueportion which cooperates with and forms a working t in the said deeperslot; the blade contacting surfaces of said wear plates also being flushwith the side surfaces of said blade slots, and locked against lateralmovement by the form of the cut-out portions and maintained thereinlongitudinally by contact with said end plates when said pump isassembled, said wear plates being removable manually by merely slidingthem A endwise in said cut-out portions when said pump is disassembled.

2. Ina rotary pump, a body having a cylindrical bore therein and inletand discharge ports communicating therewith, end plates secured to saidbody and forming closures therefor, said end plates carrying bearingseccentric to said bore, a shaft mounted in said bearings, a rotor xed onsaid shaft and having longitudinal blade slots formed therein, thetrailing faces of each blade slot having a second slot formed thereinsubstantially shallower radially than said first slot, said second slothaving its radially inner end beveled, a third slot communicating withsaid second slot extending in the same direction from said blade slotand radially narrower than said second slot, a hardened and ground wearplate of a shape to conform to and adapted to be manually slid into saidsecond and third slots endwise; the face of said wear plate being flushwith the face of said rst-mentioned slot, the radial outer edge of saidwear plate conforming to the outer diameter of said rotor and the inneredge being beveled to match the inner beveled edge of said second slot;said wear plates being retained in said second and third slots by saidend plates when said pump is assembled, and blades mounted in said slotsand adapted to cooperate with said bore.

FREDERICK KRAISSL, JR.

REFERENCES CITED The ,following references are of record in the i'ile ofthis patent:

UNITED STATES PATENTS Number Name Date 462,282 Sperry Nov. 3, 1891582,696 Schneible et al. May 18, 1897 1,043,936 Hope Nov. 12, 19121,111,160 Larsen et al Sept. 22, 1914 1,265,070 Feyzes May 7, 19181,553,095 Moore Sept. 8, 1925 1,737,942 Pagel Dec. 3, 1929 2,003,615Smith et al June 4, 1935 2,036,711 Martin Apr. 7, 1936 2,338,609Whittaker Jan. 4, 1944 FOREIGN PATENTS Number Country Date 2,646 GreatBritain 1885 142,858 Great Britain May 6, 1920 228,264 Great BritainFeb. 2, 1925 278,382 Great Britain Dec. 22., 1927 304,574 Great BritainJan. 24, 1929 310,580 Great Britain May 2, 1929 404,337 Great BritainJan. 15, 1934 722,961

France Jan. 8, 1932

